_________is used to generate electricity.

The correct answer is: All of these

Water is made to fall from a high altitude and it falls on the propeller of a turbine which is installed on the base of the dams . Water here is used for spinning the turbine. The water is made to fall through a pipe which acts as a power supply spinning the turbine which further spins a generator abd produces electricity. The electricity produced by water is called hydroelectricity
Solar Panels are installed to get electricity from sun.This is renewable energy.It has two silicon layers which produces electricity.
Wind is also used in producing electricity. Windmills have blades which are spinned by the wind. The energy spins the turbine which further spins the generator creating electricity